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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="math_toolkit.getting_best"></a><a class="link" href="getting_best.html" title="Getting the Best Performance from this Library: Compiler and Compiler Options">Getting the Best Performance
    from this Library: Compiler and Compiler Options</a>
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<p>
      By far the most important thing you can do when using this library is turn
      on your compiler's optimisation options. As the following table shows the penalty
      for using the library in debug mode can be quite large. In addition switching
      to 64-bit code has a small but noticeable improvement in performance, as does
      switching to a different compiler (Intel C++ 15 in this example).
    </p>
<div class="table">
<a name="math_toolkit.getting_best.table_Compiler_Option_Comparison_on_Windows_x64"></a><p class="title"><b>Table 23.1. Compiler Option Comparison on Windows x64</b></p>
<div class="table-contents"><table class="table" summary="Compiler Option Comparison on Windows x64">
<colgroup>
<col>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
              <p>
                Function
              </p>
            </th>
<th>
              <p>
                cl /Od (x86 build)
              </p>
            </th>
<th>
              <p>
                cl /arch:sse2 /Ox (x86 build)
              </p>
            </th>
<th>
              <p>
                cl /Ox (x64 build)
              </p>
            </th>
</tr></thead>
<tbody>
<tr>
<td>
              <p>
                boost::math::cbrt
              </p>
            </td>
<td>
              <p>
                <span class="red">5.05<br> (202ns)</span>
              </p>
            </td>
<td>
              <p>
                <span class="green">1.20<br> (48ns)</span>
              </p>
            </td>
<td>
              <p>
                <span class="green">1.00<br> (40ns)</span>
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                boost::math::cyl_bessel_j (integer orders)
              </p>
            </td>
<td>
              <p>
                <span class="red">4.38<br> (530ns)</span>
              </p>
            </td>
<td>
              <p>
                <span class="green">1.00<br> (121ns)</span>
              </p>
            </td>
<td>
              <p>
                <span class="green">1.02<br> (124ns)</span>
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                boost::math::ibeta_inv
              </p>
            </td>
<td>
              <p>
                <span class="red">4.52<br> (8277ns)</span>
              </p>
            </td>
<td>
              <p>
                <span class="green">1.11<br> (2042ns)</span>
              </p>
            </td>
<td>
              <p>
                <span class="green">1.00<br> (1833ns)</span>
              </p>
            </td>
</tr>
</tbody>
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